[U-Boot] [PATCH 3/3] mmc: fsl: introduce wp_enable

[Fabio Estevam]

Hi Peng,

On Tue, Apr 26, 2016 at 3:54 AM, Peng Fan <van.freenix at gmail.com> wrote:
> Introudce wp_enable. If want to check WPSPL, then in board code,
> need to set wp_enable to 1.
>
> Take i.MX6UL for example, to some boards, they do not use WP singal,
> so they does not configure USDHC1_WP_SELECT_INPUT, and its default
> value is 0(GPIO1_IO02). However GPIO1_IO02 is muxed for i2c usage and
> SION bit set. So USDHC controller can always get wp signal and WPSPL
> shows write protect and blocks driver continuing. This is not what
> we want to see, so add wp_enable, and if set to 0, just omit the
> WPSPL checking and this does not effect normal working of usdhc
> controller.
>
> To DT case, add wp_gpio, if there is wp-gpios provided in dts,
> wp_enable is set to 1; if no, set to 0.
>
> Signed-off-by: Peng Fan <van.freenix at gmail.com>
> Cc: Pantelis Antoniou <panto at antoniou-consulting.com>
> Cc: York Sun <york.sun at nxp.com>
> Cc: Stefano Babic <sbabic at denx.de>

Just saw this issue on a mx6ul pico board: after adding I2C support
then the eMMC could not longer be written:

=> saveenv
Saving Environment to MMC...
Writing to MMC(0)...
The SD card is locked. Can not write to a locked card.

mmc write failed
failed

Your patch allows me to write to the eMMC succesfully:

Tested-by: Fabio Estevam <fabio.estevam at nxp.com>